title: Identification of a T cell subset capable of both IFN-gamma and IL-10 secretion in patients with chronic Borrelia burgdorferi infection.
abstract: A novel population of both IFN-gamma- and IL-10-secreting human T cells that differentiate in the presence of exogenous IL-12 in vitro has recently been described. Whether this T cell population exists in vivo is unknown. Borrelia burgdorferi, the etiologic agent of Lyme disease, can induce a chronic infection in the presence of a vigorous humoral immune response. We established T cell lines specific for B. burgdorferi and tetanus toxoid from subjects with chronic B. burgdorferi infection and healthy controls in limiting dilution experiments and assessed proliferation and cytokine secretion. As expected, higher frequencies of B. burgdorferi-specific precursor T cells were observed in Lyme patients compared with controls. In both groups of subjects, T cell lines specific for B. burgdorferi secreted high amounts of IFN-gamma. However, in patients with Lyme disease, 27% of T cell lines secreted not only IFN-gamma but also IL-10, which was only observed in 0.6% of B. burgdorferi-reactive T cell lines generated from controls and in none of the tetanus toxoid-reactive T cell lines generated from either Lyme patients and controls. Single cell PHA cloning confirmed that both cytokines were secreted from one clonally expanded precursor cell. Whole mononuclear cells from B. burgdorferi-infected individuals, but not from controls, secreted IL-12. Moreover, neutralizing anti-IL-12 mAbs inhibited the generation of the IFN-gamma/IL-10 population. These data demonstrate that this novel population of IL-12-induced IFN-gamma/IL-10-secreting T cells is generated in response to chronic B. burgdorferi infection.
authors.affiliation: Center for Neurologic Diseases, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02115, USA.
authors.forename: A
authors.initials: A
authors.lastname: Pohl-Koppe
authors.forename: K E
authors.initials: KE
authors.lastname: Balashov
authors.forename: A C
authors.initials: AC
authors.lastname: Steere
authors.forename: E L
authors.initials: EL
authors.lastname: Logigian
authors.forename: D A
authors.initials: DA
authors.lastname: Hafler
mesh_terms: D000328:Adult; D000906:Antibodies / Q000494:pharmacology; D000942:Antigens, Bacterial / Q000276:immunology; D015748:Borrelia burgdorferi Group / Q000276:immunology*; D002460:Cell Line; D002908:Chronic Disease; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism*; D016753:Interleukin-10 / Q000378:metabolism*; D018664:Interleukin-12 / Q000037:antagonists & inhibitors / Q000276:immunology / Q000378:metabolism; D008193:Lyme Disease / Q000276:immunology* / Q000382:microbiology; D008213:Lymphocyte Activation; D018655:Lymphocyte Count; D008875:Middle Aged; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism* / Q000382:microbiology; D013745:Tetanus Toxoid / Q000276:immunology
chemical_list: D000906:Antibodies; D000942:Antigens, Bacterial; D013745:Tetanus Toxoid; D016753:Interleukin-10; D018664:Interleukin-12; D007371:Interferon-gamma